Trenchless Technology

NOV 2018

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34 T R E N C H L E S S T EC H N O LO GY N OV E M B E R 2018 This project requires the microtun- nel run to be installed on a unique double curved alignment . A 199-lf curve on an 800-ft radius will be in- stalled coming out of the launch shaft , followed by 570-lf of straight tunnel , then another 297-lf curve on an 800- ft radius. S -1 shaft construction has begun. The microtunnel run from S -1 to DVRCS 2 is anticipated to be complete by the end of 2018. The project owner is the Northeast Ohio Regional Sewer District (NE- ORDS). AECOM is the engineer. Super Excavators will use an Akkerman SL74 MTBM to complete the microtunneling portion of the project, which is valued at approximately $2.38 million. OREGON T UA L AT I N Tualatin Interceptor and Siphon Im- provements – King City Siphon Michels Tunneling The Tualatin Interceptor and Siphon Improvements – The King City Siphon will replace the original wastewater interceptor, which was constructed in 1974 and has reached its useful life. The new siphon will be fitted with seismically resilient pipe that is better suited for the corrosive environment within the pipeline. When the entire interceptor project is completed, this $30 million upgrade will provide a pipeline that will handle capacity for the municipality through 2040. The microtunneling portion of the project is valued at about $3 million. Michels engaged in the design-build portion of this project with Morten- son Construction in 2017. Over a peri- od of eight months, numerous design proposals were vetted and the final design resulted in a siphon structure for the trenchless crossing under the Tualatin River. Michels will be in- stalling this siphon structure which consists of a 470-ft long , 82.7-in. di- ameter tunnel via microtunneling ap - proximately 30 ft under the Tualatin River. The microtunnel has a 650-ft vertical , curved radius that requires the installation of specialized RCP, engineered specifically to withstand the large jacking loads required to obtain the vertical curve. In addition, the joints will be fitted with hydraulic joint controls from Jackcontrol to al - low for the curvature of the pipe. The carrier pipes will be three HDPE lines, 14-, 16- and 30-in. in diameter, which will be bundled together to follow the curved alignment . When completed, these carrier pipes will replace the original wastewater siphon and pro - vide service for the municipality. The Herrenknecht AVN1800 MTBM is equipped with double steering ar- ticulation to accommodate the radius of the curve and a telescopic section for advancement of the machine. As of the end of October, the job was in initial site mobilization, with min- ing estimated to start Nov. 6, 2018, with completion of the tunnel project in full by Dec. 30, 2018. Owner: Clean Water Services; Engi- neer: Kennedy Jenks, Aldea Services; Prime Contractor: Mortensen Con- struction. PENNSYLVANIA E L LWO O D C I T Y Ellwood Water Treatment Plant Bradshaw Construction Corp. Construction for this $7.3 million project is in progress and includes 1,531 ft of two -pass microtunneling in three tunnels. Casing size is 60-in. and 75.4-in. with several lines of car- rier pipes to be installed. Subsurface conditions include unweathered hard rock and mixed face. The job began in September 2017 and is approximately 85 percent com- plete. Owner: Pennsylvania American Wa- ter Company (PAW); Contractor: Layne Heavy Civil Inc.; Engineer: Buchart Horn /Garnett Fleming ; Equipment : Herrenknecht AVN-1500T. Bradshaw Project Manager: Mike Wanhatalo. TEXAS H O U S TO N 108-in. Waterline Smith to Lee Rd. Vadnais Trenchless Services Inc. This $4 million project for the City of Houston consists of a single mi- crotunnel drive of 885 lf of 126-in. Permalok steel casing with 108-in. welded steel waterline carrier. Shafts for the microtunneling will be built by the general contractor, Harper Broth- ers Construction, and likely will be constructed using sheet piles. The microtunnel will be installed in clay- ey soils, granular formations and con- taminated strata (PPCA). This tunnel is being installed be- neath US Highway 59. There is limited space to work at each end of the cross- ing , as this is one of the busiest parts of town. The geotechnical report and plans suggest grouting approximately 360 lf of granular formations zone, but Vadnais plans to use its closed face slurry microtunneling technology to tunnel through this faulty zone with- out any grouting /ground stabilization. Mobilization is scheduled to begin in early-2019 and is scheduled to be complete in approximately 3 months. Engineer: Lockwood, Andrews and Newnam; MTBM: MTS 2430 MTBM (128-in. OD). L I B E R T Y Sanitary Sewer System Improvements Phase 1 Vadnais Trenchless Services Inc. This $1.3 million project consists of 1,177 lf of 30-in. FRP microtunneled pipe installed over three separate drives and 792 lf of 24-in. FRP microtunneled pipe installed over two drives. Shafts for the microtunneling will be built by the GC and likely will be constructed using conventional trench shoring boxes and slide rails. The microtunnel will be in- stalled in primarily sandy silts and clay- ey soils with lenses of sand. The tunnel will be approximately 12 ft below the groundwater table. One of the tunnel drives will be in- stalled perpendicular to US Highway 90 towards the existing lift station and four other tunnel drives will be installed along Highway 90. Since all of the jacking shafts are on south side corner of Highway 90 and in between active/busiest local businesses, there is limited space to work at each end of the tunnels. Mobilization began on Oct. 1, 2018, and will be complete on March 18, 2019. N O R T H A M E R I C A N M I C R O T U N N E L I N G 2 0 1 8 R E V I E W M I C R O T U N N E L I N G J O B L O G 2 0 1 8

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